Dog bed



FIG. 1 is a front elevation view of a dog bed, showing my new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is an enlarged left side view thereof;

FIG. 6 is an enlarged right side view thereof; and,

FIG. 7 is a left, bottom and rear perspective view thereof.

The broken lines illustrate portions of dog bed that form no part of the claimed design. 

CLAIM The ornamental design for a dog bed, as shown and described. 